------------[ cut here ]------------
WARNING: CPU: 1 PID: 11293 at drivers/gpu/drm/vkms/vkms_crtc.c:97 vkms_get_vblank_timestamp+0x17d/0x1a0 drivers/gpu/drm/vkms/vkms_crtc.c:97
Modules linked in:
CPU: 1 UID: 0 PID: 11293 Comm: syz.0.1579 Not tainted 6.15.0-rc2-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:vkms_get_vblank_timestamp+0x17d/0x1a0 drivers/gpu/drm/vkms/vkms_crtc.c:97
Code: ff df 80 3c 08 00 74 08 4c 89 f7 e8 0d 0e e5 fb 49 89 1e b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 c4 d3 7a fb 90 <0f> 0b 90 eb e4 89 d9 80 e1 07 38 c1 0f 8c b9 fe ff ff 48 89 df e8
RSP: 0018:ffffc900049bf6c8 EFLAGS: 00010293
RAX: ffffffff8648816c RBX: 00000065bfa84773 RCX: ffff888034fcda00
RDX: 0000000000000000 RSI: 00000065bfa84773 RDI: 00000065bfa84773
RBP: ffffc900049bf860 R08: ffffffff864880d1 R09: 0000000000000000
R10: ffffc90003519000 R11: ffffffff86487ff0 R12: 00000065bfa84773
R13: ffff8880213dc950 R14: 1ffff92000937f0c R15: ffff888141f4c028
FS:  000055556ec56500(0000) GS:ffff888125093000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2a6e1d CR3: 0000000028ce8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:878 [inline]
 drm_crtc_next_vblank_start+0x255/0x4f0 drivers/gpu/drm/drm_vblank.c:1012
 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1596 [inline]
 drm_atomic_helper_wait_for_fences+0x27c/0x8e0 drivers/gpu/drm/drm_atomic_helper.c:1643
 drm_atomic_helper_commit+0x53f/0xa00 drivers/gpu/drm/drm_atomic_helper.c:2072
 drm_atomic_commit+0x296/0x2f0 drivers/gpu/drm/drm_atomic.c:1518
 drm_client_modeset_commit_atomic+0x677/0x7d0 drivers/gpu/drm/drm_client_modeset.c:1079
 drm_client_modeset_commit_locked+0xe0/0x520 drivers/gpu/drm/drm_client_modeset.c:1182
 drm_client_modeset_commit+0x4a/0x70 drivers/gpu/drm/drm_client_modeset.c:1208
 __drm_fb_helper_restore_fbdev_mode_unlocked+0xbd/0x200 drivers/gpu/drm/drm_fb_helper.c:237
 drm_fbdev_client_restore+0x34/0x40 drivers/gpu/drm/clients/drm_fbdev_client.c:31
 drm_client_dev_restore+0x132/0x270 drivers/gpu/drm/drm_client_event.c:116
 drm_lastclose drivers/gpu/drm/drm_file.c:396 [inline]
 drm_release+0x335/0x410 drivers/gpu/drm/drm_file.c:429
 __fput+0x3e9/0x9f0 fs/file_table.c:465
 task_work_run+0x251/0x310 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd364b8d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd364ecfb88 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fd364da7ba0 RCX: 00007fd364b8d169
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fd364da7ba0 R08: 0000000000001b70 R09: 0000001d64ecfe7f
R10: 00007fd364da7ac0 R11: 0000000000000246 R12: 000000000006ab0d
R13: 00007fd364da6240 R14: ffffffffffffffff R15: 00007fd364ecfca0
 </TASK>